©
2009 Magnum Energy Inc
Page 30
The Charge Mode provides up to four separate charging stages: Bulk Charging, Absorb Charging,
Float Charging and Full Charge.
Bulk Charging;
This is the initial stage of charging. While Bulk Charging, the charger supplies the
battery with controlled constant current. The charger will remain in Bulk charge until the Absorp-
tion charge voltage (determined by the Battery Type selection*) is achieved. The inverter’s green
LED stays ON (solid) to indicate Bulk charging.
Absorb Charging;
This is the second charging stage and begins after the absorb voltage has
been reached. Absorb Charging provides the batteries with a constant voltage and reduces the
DC charging current in order to maintain the absorb voltage setting. The inverter’s green LED
fl
ashes once every second (fast
fl
ash) to indicate absorption charging for 2 hours (determined by
the Battery AmpHrs selection*), then switches to Float Charging.
Float Charging;
The third charging stage occurs at the end of the Absorb Charging time. While
Float charging, the charge voltage is reduced to the
fl
oat charge voltage (determined by the Bat-
tery Type selection*). In this stage, the batteries are kept fully charged and ready if needed by
the inverter. The inverter’s green LED
fl
ashes once every 8 seconds (slow
fl
ash) to indicate
fl
oat
charging. The
fl
oat charging stage reduces battery gassing, minimizes watering requirements (for
fl
ooded batteries) and ensures the batteries are maintained at optimum capacity.
Full Charge (Battery Saver™ mode);
The fourth stage occurs after four hours in the
fl
oat
charging stage. The Full Charge stage is designed to keep batteries fully charged over long peri-
ods and prevent excessive loss of water in
fl
ooded batteries or drying out of GEL/AGM batteries.
In this stage the charger is turned off and begins monitoring the battery voltage; if the battery
voltage drops low (25.4 VDC or less on 24-volt models; or 50.8 VDC or less on 48-volt models),
the charger automatically initiates another four hours in Float Charge.
Info:
If the battery voltage falls to the re-bulk voltage (24.2V on 24-volt models or
48.4V on 48-volt models) or lower, the unit will begin another Bulk charge.
* These settings in the MS-PAE Series are changeable and leave the factory with default values (see
Table 3-2, Inverter/Charger Default Values). These default values are adequate for most installa-
tions, however, if you determine that some of the values need to be changed for your particular
system, the ME-RC50 remote control may be purchased to adjust these settings.
Figure 3-3, Automatic 4-Stage Charging Graph
Constant
Current
Reduced
Current
Reduced
Voltage
Absorb
volts
Max
Charge
Rate
Increased
Voltage
Constant
Voltage
Monitored
Voltage
No Current
Monitored
Current
Bulk
Charging
Absorb
Charging
Float
Charging
Full
Charge
Goes to Full
Charge after
4 hours in
Float Charge
A b so r b
T im e
Float
volts
Time
DC
Voltage
DC
Current
Operation
